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Niels Lohmann
ae30ba55c3
The previous change handles plain strings of up to 16 characters with two overlapping 8-byte words. With SSE2 or NEON, two overlapping 16-byte vectors do the same for 16 to 32 characters: one test for a quote, backslash, control character, DEL or non-ASCII byte over both, and two stores. Targets without either keep the limit of 16. Apple M1, Apple clang, retired instructions per dump(), on top of the previous changes (it replaces the table of #5878 for these strings): keys and values of 1..40 characters 7.07M -> 4.94M (-30 %) twitter 4.15M -> 3.30M (-21 %) paths 9.09M -> 8.08M (-11 %) citm_catalog 5.76M -> 5.53M (-4 %) jeopardy 461M -> 451M (-2 %) Linux x86-64 (callgrind), gcc 13 / clang 18: twitter -11 % / -9 %, keys and values of 1..40 characters -19 % / -17 %, paths -7 % / -7 %. Documents without strings in that range are unchanged. Signed-off-by: Niels Lohmann <mail@nlohmann.me>